Auxiliary printing mechanism



Dec. l, 1936. M. GARBELL 2,062,746

AUXIL IARY vPRI NT ING MECHANI SM Filed April 1s, 1954. s sheets-sheet1` 2 Dec. 1,1936. M GARBELL 2,062,746

AUXILIARY PRINTING nmmmrsg Filed April 1:5, 1934v :s sheets-sheet 2'Dec. 1, 1936.

M. GARBELL 2,062,746I

AUXILIARY PRINTING MECHANISM Filed April 13, 1934 3 Sheets-Sheet 3 i 43"figg KV r I i IC',

77 75 MAR22 Q Patented neegfi, i936 I ulsurnli'- srirrlsl AUxmIARYPnIN'rmG MEcnANIsM Max Gai-bell,v Chicago, lll.,V assignor to VictorAdding Machine Company, Chicago, lll., a corporation oi DelawareApplication April 13, 1934, Serial No; *120;397

t 190mm. (o1. 101e-fes) -This invention relates to an auxiliary printingunit and is illustrated as being attached to an f adding 'machine withthe printing portion thereof alignedin the printingline for making anim- 5 pression simultaneously with those ofthe type bars actuated duringthe operation of the machine.

A unit of this kind is shownasmounted adjacent one side of the type barsof the adding machine and is adapted tomove into and out of the printling line being .yieldingly retainedin normal re.`

tracted position and readily engageable by means of links and leversextending into the path of the unit and the operating mechanism of theadding' machine.

l The printing portion of the unit as shown will print a serialnumber'an'd the date, but these characters may be changed, as they formno part of the present invention other than to be automatically`adjusted with each operationof the 9 0 machine while others of thecharacters are manually adjusted. Y

The chief objects of the invention are the pro'-l vision `of a printingunit having adjustable elements, som`e of which have characters, whilevothers have digits thereon and which are mounted to move in a path withthe unit for an impact against a platen or other suitable backing memberand to be automatically restored and retained in a normal at-restposition, being also provided with -3'0 a feeding mechanism'whichautomatically adjusts 'some ofthe printing elements with each'operationof the unit.

A further object is the provision oi an 'actuating or tripping mechanismadapted to engage the unit for moving the same against the' tension ofits spring which draws the unit for an impact against the platen orbacking member as the tripping mechanism is released therefrom in thenormal operation of the machine, and said unit be- 40 ing providedwith'ya yieldable retaining means which normally withholds the same outof the path of the platen or `backing member after the impact thereofagainst said platen or backing member.

.45 A still further object is the provision, of a movable engageablemember carried on the unitl which is yieldingly retained into the pathof the actuating or tripping mechanism which 'when engaged thereby, willcause a normal-Ioutward vmovement ofthe unit against the tension of itsspring for vcausing an impact oi the digits and characters when releasedagainst the platen and wherein the said engageable means will yieldinglyride over operation of the machine.

and again restore itself for lengagement by the tripping mechanismwitheach operation of the machine by means of the normal tension exertedby a yieldable means which serves in the capacity of restoring theunitand for positioning the feeding mechanism thereof readily operablewith each A nd a still further object is the provlsionfof manuallyoperable means for positioning and retaining the engageable means -outof the path of the tripping mechanism so as to be ineffective therewithto render the unit inoperable with said 10 tripping mechanism during thedriving operations of the machine;- to provide means for bodilyadjusting the unit longitudinallyof the platen or backing member wherebythe printing elements may be spaced 'at various distances with respectto 5 the typebars of the adding machine, and wherein also, thefinkingribbon is automatically and simultaneously adjusted with, the unitproviding an inking means therefor.

Referring to the drawingsf- '20 )Figure l is a top plan,view of the typebar por--` tion and ribbon spool plate of an adding machine withmy'printing unit mounted thereon by means of a supporting plateextending outwardly on one side thereof andon which the unit is mountedto 25 -slideadjacent the type bars.

Figure 2 isa face elevation view takensubstan# tially on the lin'e 2-2of-Fig. l looking in the` direction of the arrows f, Figure 3 is a sideelevation illustrating the rib- 30 bon spooll plate with my devicemounted thereon and the actuating mechanism therefor connected to theoperating mechanism of an adding machine.

-Figure '4 is an enlarged' cross-sectional view Vtaken on the line 4-4of Fig. 1 showing the. yield- 35 able means for -holding 'the unit inretractedposition and in dotted lines as yielding for an impact of rtheunit against' the' platen.

Figure 5 is anv enlarged detail cross-sectional view taken on the line5-5 of Fig. 1.- 710 Figure 6 isan enlarged detail cross-'sectional Viewsimilarto Fig. 5 illustrating the device as bef ingrretracted and inengagement with the platen m dotted lines;

45 Figure 'Tis an enlarged side elevation of the U-A shaped rockablemember illustrating the openings therein into which the pins extend toAconnect the arm thereto forl actuating the same. r

Figure 8 is 'an enlarged detailcrosssectional*50^ view taken on the line8 8 of Fig.- 1 illustrating j the adjustable means forthe unitsupporting pute.v

Figure 911s a partial detail viewof a portion or l the charactersprinted-55 the ticket illustrating 30 l more commonly used for thepurpose o'f printing 'I'he reference numeral I Il designates the ribbonspool plate or base which is common construction in adding machinedesign and onwhlch the ribbon spools II and I2 respectively are mountedbeing supported on the vertically extending spool "shafts I3 and I4 andsecured thereto by means of the thumb nuts I 5 and I5 respectively.These ribbon spools II and I2 are arranged in side by side relation forthe purpose of providing a double ribbon across the face of the usualtype `bars of the adding machine and my improved unit which is'ada'ptedto coact therewith for simultaneous printing with the type bars. 'I'heribbon II as shown, extends from the ribbon spool II over a guide rollI8 n xed to the ribbon spool plate I0 and to a guide roll I9. which isfixed to the ad justablesupporting plate Ila and the rollers I8 and ISform a guide for the ribbon therebetween on opposite sides of the typebars and my improved unit. The ribbon II'then folds back upon v*itselfand is,gu`ided inparalielrelation with its otherportion by means of aguide roller arranged on the supporting plate I 8a adjacent the rollerI5 and which guides the same to the rollei 2I ilxed in the-ribbon spoolplate I5 adjacent the roller I 8 and guides the ribbon to the ribbonspool I2. Many forms of double -ribbon arrangement may be employed witha unit of this type. as it is v iii-duplicate, providing a priginsi siipor'ucket and having a record strip for recording the amounts which havebeen printed on the slips or tickets. In illustrating this form ofribbon inking means, I also showfa reversing mechanism indicated as awhole as 22 which is provided with a pairof Compression springs 23 and24 surrounding the respective vertical ribbon spool shafts I3 and g I4for exertinga frictions] tensionito the turning movements ofitheseshafts to insure a .taut parallelfribbon across the printing face ofthel type ing machine (not shown), and intermittently enbars and my.improved unit.

' "I'hetypeV bars of the adding machine are designated as a whole as 25having theusual hammers 25 which are common in their'construction being.operable by means of the hammer actuatingshaft 21 which has a bifurcatedarm 28xed thereto i into which a stud 29 of a bell-crank 38 extends. Thebell-crank 38 is plvotally supported for rocking movements on a stud 3|fixed to the side wall 32 of the adding machine .and has its other le`g33 provided with a bifurcated portion 34 'adapted to be engaged by astud 35 fixed to an arm 35 which is carried on a stud 3'I fixed to theside wall 32 of the adding machine. The arm 351s operatively connectedto the driving/.fuiechanism of the addgages the bell-crank 38 foractuating the hamimers as the machine is operated.

My improved-unit designated as a whole as 35, is mounted for slidingmovements on a plate Illa jadiustsbiv secured' on the ribbon spool plate'lo and extends outwardlyand'adjacent one side .of

the typ'ebars" of the addingmachine. -The frame of the' 3 8 isUshaped'-as'.viewed in end elevation '(Flg.=2),iandhas a bottom wall 38and in-` tegral upwardly extending side walls 48 and 4I. The bottom-wall`35 has a plurality of studs 42, 43

-and 44`v n xed thereto that 'extend downwardly through elongated slotopenings, ..nd 41 respectively in the adjustable supporting plate. I Ia.

z These slot openings 45, 45 and 41 are'arranged to lguide the. unit inits sliding movements on the 15 supporting plate Ila'and' Ifoja v tooutwardly of and 44a on the respective studs 42, 43 and 44 serve asspacers and provide a three point contact for the sliding movements ofthe unit on the supporting plate Illa. The side walls and 4I of theframe of the unit 38 are provided with a pair of aligned transverseopenings through which the shafts 48and 49 extend. 'Ihe shaft 484carries a plurality of rotatably mounted printing elements able indiciathereon and are arranged in groups by means of retaining members 53which are re-4 siliently held therewith by means of ilared nger springs54 secured at 55 to a horizontally extending member 55. 'Ihe member 55has a downwardly extending portion 5 1 at each end thereof which iswelded or otherwise secured, at 58 to the side walls 4|! and 4I of theunit 35.

The printing elements 5I are each engaged by means-of a ratchet feed dos59 which also coacts with the integral ratchet-wheel 52 of theseelements and are carried by means of a U-sh'aped rockable member 50supported for rocking move` ments on the printing element shaft 48. The

U-shaped member 55 has an arm 5I ilxed therethis side wall 4 I by meansof the pins 52 and is carried for rocking movements with the U-shapedmember 5l on the'shaft 48. 'I'he 4pins 82 extendthrough arcuate slotopenings 53 in the side wall 4I of the unitand fit into correspondingopenings V52a in the leg 68a ofthe U-shaped member 88. The arm 5I isnormally urged upwardlylby means of a 'torsion spring 54 having its bodyportion coiled around the free end of the shaft 48 and outwardly of orcarriers 50 and 5I which are provided with suitas shown with the rstthree'elements 50 adjacent .the side wall 40 arranged to be manuallyadjusted the arm 5I, with 4one leg of said spring engagv ing a roller 55xed to the free end of the arm v-Iil and with its other leg extendingdownwardly and through an elongated slot opening 56 in the l adjustablesupporting plate Illa and normally engaging a pin 51' fixed to the sidewall 4I'of the unit 3 8. The pin 51 formsa permanent abutment for thedownwardly extending leg of the' torsiolbspring 54 which causes itsother. leg

to elevate the Iarm 5I-by means of its engagement with the roller 55.thereof.

The lroller of the arm 5I is normally retained in sliding contant with acam sui-face sa i of a cam' member 55 fixed to'the supporting .plateIla. and while the unit, is being moved by means of the actuatingmechanism which will `be presently described, the roller 55 will ride onthe cam surface 58 of this cam member 59 andcause a downward rockingmovement of the arm 5l which will cause a partial turn of1one of theelements 5I. Upon a reverse movement of the unit 38, -the torsion spring54 will again restore the arm I and as the movement of the unit isrepeated, a stepv bystep feed of the elements 5I will be had so as tosequentially change Othe serial number of each record `made.` 'I'histurn or step by step 'feed o f the elements 5I is not 4new and it isthought that a brief statementof the operation will sumce for theoperation thereof with! my. improved unit.

The operating mechanism for the device comprises an engageable arm 15iixedly secured to u a stud shaft- 1| which is slidablym'ounted forlongitudinal sliding movements .in'a bushing 1|a pivoted in the lsidewall 32 of vthe addingmachine. The -stud shaft 1| is provided with a-keyway 1lb adapted to be engaged by means of `the depending arm lawhichis' secured to the bushing 1|a and by reason of the keyway 1lb the arms10 and 10a arerockab'le together as a unit with the stud shaft 1|` Thedepending arm 10a -has its lower end portion provided with a bifurcatedopening-12 into which a roller 13` extends and4 which is fixed on thebell-crank 30 by means of the stud 14. The freeupper endV 15 of the armA,10 extends through an elongated slot opening 16 in the supportingplate |0a and through -a corresponding aligned slot opening 11 in thebottom wall 39 of the unit 38. LThe up r end 15 of the arm 10 extendsintothe pat of a yieldably mounted movable member lI8 car' ried forrocking movements on the shaft 49 be-A .held in position into ythe pathof the end 15 of the arm 10 by meansv ofv a tension spring 82 xed to thearm 8| thereof and to the crossmember 56. 'Thearm 80 of the movablememfber 18 is provided 'with a roller 84 carried on a stud 85 which isixedto the free end thereof and which is` adapted to normally rest into'a recess y86 providedin rthe edge of an upwardly 'extending arm 81pivotally carried on the shaft 49 adjacent the extendingarm 88 of themovable member 18. The arm 81 is adapted to be moved manually and isretained in either its normal or changed position by. means of a springfas nxed to the bottom wall se of. the unitaria has its free end portion89 extending upwardly and formed to fit one or the other of a 'pairofnotches 98 inthe arm 81.. This spring 89 oiers a suicient tensiontowithhold the 'arm 81 in either its normal or changed position and whenmoved, by rocking the same downwardly, as shown in dotted lines (Fig.5), the notched-out portion 86 of tthe arm 81 will engage the roller 84and cause a :downward swinging movement of the extending arm 88 and arocking movementof the movable member 18 and raisethe transverselyextending portion 19 thereof out of -portion 1e wi11 be out of the pathof the enti 15 Lo. A 7 vthe spring sl is. very nght when the device is mn of the a'rm 19 and win/not be effected.

The unit 38 is adapted to-be spring-impelled for an impact against the.platen A of. the adding machine and.v a tension spring- 9| is attachedt0 the depending portieri` or. the situa of th unit and to afstud 92xedto the underside ofthe supportingplate |a. Theeifect of this tensionspringtl 'is to normally retain the'unit 38 adja- ,cent to andvretracted frein the platen A of the adding machine, for as shown. thetension of its normal at-rest position (Fig. -The spring 9| coacts withthe torsion spring 64 in retaining the unitin its normal at-restpositioniFig. 4),`

a movement of the unit V38 leg of the spring 64 intok engagement withthe end 66a of the elongated slot opening.

AS thus far described, it will be noted that as the machine is actuated,av rocking action of the arms and 10a will be had andeach rocking actionof these arms will cause the unit 38v to be moved away'from the platen Aby means oi' the engagement of thee'nd 15 of the arm 18 with thetransversely extending portion 19 of the movame member is carried on theshaft 49:' Eachmovement of the unit 38 causedby the rocking action ofthe arms 10 and 18a with their pivot stud 1|, will cause the unit to becarried a given distance. against the tension of the spring 9|. 'I'herocking action of the arm 10 and 1|la vwill cause the end 15 of the arm10 to automati- A cally disengage the abutting portion 19 of the movablemember 18 which will permit the unit to be free thereof` for-a returndriving movement under the tension of 'its spring 9|. This return actionof the unit 38 under the tension of its spring will be instantaneousupon the release of the end 15 of the armI 10 therewith and the V speedwith which the unit is being carried under the tension of the spring 9|will cause the down-I wardly extending leg of the torsion spring' slotopening 66,the unit will again be restored Ato its normal at-restposition under a very light spring tension exerted by the spring 9|until the l restoring action of the depending leg vcauses the pin 61 toagain engage this depending leg of the spring 64.

As the unit is being moved as above described.

the roller 65 of the arm 6| will be caused to ride on the .cam surface68 of the cam. member 69 and cause -'a rocking movement of the arm 6|and'a step by step feed of theelements' formi serial numbers with eachimpact of th e unit gainst the platen A of the adding machine. p

The double inkingribbon arrangement is for the purpose of doubleprinting with one impact of either the printing unit or of the type barsof the adding machine and for that purpose I provide a guard 93 adaptedto be carried on the paper table B of the* adding machine for guidingthe usualfpaper strip C which is fed around the platen A'by means ofpaper feed rolls D of the adding machine and which witlimy improved unitmay provide a permanent recordI of the impressions made on the cardsorutickets that are positioned in front thereof to receive the directimpact of the unit and the type bars and through which the record ismade. be supported on the paper table B by means of screws 94 andprovides an opening 96 therein vfor the insertion 'of the card or ticketto be printed.V

The supporting plate lila for the unit 381s carried'on the ribbon spoolplate I0 `and is" adjust able thereon so as' topositionthe unit adjacentto or away from the type barsofthe adding machine. VThis adjustment'isfor the purpose of positioning the unit so as to meet the requirementsofthe various types `of tickets ,that may be used with a unit of thiskind. The ribbon spool plate I0 is formed with a depressed portioTheguard 93 may 'which itl may be slidably adjusted. The support- A l pK .ing plate Illa. is provided with an elongatedslot- 7 and 'tends toretain the downwardly extending .openngtc aligned with a'companin slotopening lld provided in the-extension |0b of the ribbon spool plate I0and has a rivet |0e extending through these slot openings for retainingthe supporting plate |0a slidably movable on the ribbon spool plate I0.

In order to lock theV supporting plate |0a Von the ribbon spool platel0, I provide a depressible button or knob |0f-fixed to a member |0gwhich has a depending stud |0h-i0h at each end thereof. and which areprovided on their free end portions with a shoulder lili- |011 adaptedto extend into enlarged op/enings |07' in the. extension |0b of theribbon spool plate |0. These shoulders |0h-I0h are urged and retained infthe enlarged opening |07' by means of the compression springs |0k-I01c.interposed between the supporting plate |0a and the member |0g. Theseenlarged openings |07' in the ribbon spool plate |0 are interconnectedby means of a slot opening |01 extending the entire length ofv the`enlarged openings |07', forming a continuous opening with theseenlargements to permit of the sliding movements of the stud |0hf-I0htherein. When the requirements are for a larger ticket, or where theprinting of the characters carried on the unit are to be .spaced agreater distance from those of the type bars of the adding machine, thesame may be'accomplished by simply depressing the thumb portion |01which will compress the springs |0Ic|0k and force the shoulders |0i-I0iof the studs IIb-|011. out of the enlarged openings |07 in the ribbonspool-plate I0 and by retaining the thumb piece i0! in its depressedposition, the unit 28 and the supporting .plate |0n. may be bodily movedfor a sliding movement parallel with the axisof the platen A and whenthe desired position is found, the release of the thumb f piece I 0fwill permit the springs |0k|0k to re store' the shoulders |0|0i of the'studs |0h|0h into the aligned enlarged openings |01 in the extension|0b o f the ribbon spool plate and retain the unit in adjusted lockedposi- In adjusting the supporting plate .|0afor the positioning of theunit 38 with respect to the type or ticket used, it win be noted, thatthe of the keyway 1lb coacting with -the bushing "na, '5nd 1n thismanner the arm 1n is rockable with the arm 10a .with each operation ofthe .machine regardless of the adjusted position of o spool plate Il.lIt will be noted that the adjustment of the unit 28 by means ofdepressing the thumb piece ilf will also adjust the length of the'ribbon by means of the movement o'f the rollers I0 and 2l with the plate`|01, so that upon adjusting the unit for various positions,

the ribbon I1 will be automatically adjusted therewith to be aligned inprinting relation with respect to this unit 38 and also the type bars 25of the` adding machine.

In Figure 9, a partial detail view is shown o the ticket or slip onwhich the impressions of the unit and the type bars of the addingmachine are made. The printing elements 5| Vof the unit print inthe'serial number comprising the ilrst four numbers shown in thisfigure, while the printing elements 50 mark the 'month and day, and theremaining characters on the ticket such as C and 6.00, are made by thetype bars oi thel adding machine.

A unit-of this type may be provided with sunlcient characters dependingupon its width so as to print more characters, for example the year, andwhile I have shown a plurality of vprinting elements, any number may beused with..r espect to the requirements to which a unit of this typemaybe adapted without departing. from vthe scope of the invention, andwhile I have illustrated and described my improved unit as beingoperable with an adding machine, the same may be applied to other typesof machines, or the device may be a separate unit embodying operatingparts similar to those connected to the adding machine, and insuch. amachine it may be found desirable to omit some of the operating partswithout departing from'the scope of -w'ith a platen `or backing memberadapted to .receive the impact thereof, a base supporting the unit, .ofprinting elements carried on the unit, actuating means engaging saidunit for movement therewith in one direction of its travel and to thendisengage the same. means exerting an increased pressure to saidtraveling movement of the'unit whereby said unit will be carried in thereverse direction -for an impact against the platen or backing memberwhen said actuating means are released from engagement therewith; andlmeans on the unit yieldlngly engaging the `base forming means fornormally retaining the unit at retracted position,said last mentionedmeans being free of the base while saidiunit is moved by the actuatingmeans.

2. A printing unit of4 the character described, comprising a slidablymounted-body, a plurality of `printing elements carried on said body andextending outwardly of one end thereof, a base supporting-the body f orsliding movements thereon. impelling means normally urging said unit inone direction, yieldable means=on the unit coacting with the basenormally resisting said impelling means and retaining the unit in normalposition, actuating means urging said unit in a .direction against itsimpelling means, and to release the same, said yieldable means formingmeans for cushioning theA unit when released from its actuating means.

3. In a printing unit of the character described, the combination withladjustable .printing elements employing a platen, of printing elementsseparate from and carried coaxially with/'the adjustableprinting..elements and operable to print digits aligned therewith on saiiiplaten;c means adjusting .the digit elements for v'a plurality ofsuccessive`positions, yieldable 'stop means, an impellent for theprinting unitcoacting with the yieldable stop means and normallyretaining said -unit retracted from the platen, and actuating impellentand to release the same to be impelled thereby for' an impact; againstthe platen, Vsaid unit having means thereon 'rendering the same readilyengageable by the actuating means with each stroke thereof.

4. A printing unit ofthe character described, comprising a body memberhaving an impellent to move the same in a path to coact with a platen,

printing elements carried on the body memberv and normally retracted.from the platen, an actuating means for said unit, an adjustable membernormally in the path of an adapted-to be engaged by said actuating me sto cause the movement of said body member in one direction of (its pathof travel, saidy actuating means automatically disengaging saidadjustable member land permitting said body member to be carried by itsimpellent for an impact of the printing elemnts against the platen, andmanually controlled means associated with said adjustable member forrendering the same ineffective with said actuating means.

5. In a device of the character described, the combination with typecarrying printing elements and a supporting frame therefor, avbase onwhich the device is mounted for reciprocating movement away andtoward aplaten, of spring-impelled meansfor Icausing the movement of said frameand printing elements in one direction on said base, of actuating meansfor causing the movement of said device to exert` a tension on saidspring-impelled means. and to be automaticallly disengaged therefrom,stop means including yieldable means coacting with the base wherebysaid` device will -be carried to normal position after saidspring-impelled means have actuated the same for an impact against theplaten, and means on the device forming means to carry said yieldablemeans therewith during its movementswith the actuating means an'd forpermitting said yieldablemeans to again coact with the base forretaining the device in normal position. 6. AIn an auxiliary printingmechanism, the .combination with rotatable type carriers'mounted to movein a path into printing relation with a platen,an impellent normallyurging. said printing mechanism toward the platen, engaging .meanscausing a normal movement thereof against said impellent and to releasethe same for an impact against the platen, and means adapted to bemanually actuated for rendering the printing mechanism inoperable withsaid engaging means.

7. A printing unit of the character described,

the combination with Pa platen, of .a spring-impelled body memberadapted to move in a path,l

printing elements carried on the body member and adapted to coact withsaid platen and being normally retracted therefrom, an adjustable membercarried on said body member, a tripping Vmeans adapted to' engage saidadjustable member to cause a given movement of said body member againstthe tension of its spring'and to be automatically disengaged Ytherefromat the limit of its movement whereby said body member will be carriedby' its spring for an impact against said platen, and feed meanscoacting with said printing elements .for adjusting'them with eachoperation. of the tripping means. 8. A printing unitof the characterdescribed,

. comprising type carrying elements having a sup'- porting frametherefor mounted for reciprocating movements on an adjustable base and.adapted to coact with a platen, spring means for causing the movementof said unit for an impact against the platen, means for withdraiivingvsaid unit preparatory to the release thereofy to eect printingimpressions by an impactag'ainst the platen, and means for` manually'adjusting said I elements having a supporting base therefor mounted forreciprocating movementson an adjustable base, yieldable means forcausing the movement of said unit toward the platen, means forwithdrawing said unit preparatory to the release thereof to effectprinting-impressions ofV the type carrying elements byan impact againstthe platen, meansiormanually adjusting said adjustable base forselectively positioning the unit longitudinally of the platen, andvribbon inking means having a portion thereof carried on and movable'with said-adjustable base whereby upon adjusting the unit longitudinallyof the platen said ribbon inking means will be automatically adjustedtherewith,

12. The combination' of claim 11 hereof 1nwhich the adjustable baseis-provided with lock- Ping means for holding the unit in fixed adjustedposition with respect to the longitudinal axis of the platen. e

13. Thecombination of claim 11 .hereof in which the means forwithdrawing said unit is movable with the adjustable base .Whileremain.-

ing in driving relation-with the printing unit.

14. A spring-impelled printing unit adapted to-coact with a platen orbacking member and having a plurality of rotatable typeA carryingelements, rockable 'engageablermeans on the unit, of means for engagingthe rockable engageable means for withdrawing the unit lpreparatory tothe release thereof to effect a spring-impelled movement of said unitfor an impact against the platen, and me'ans for manually effecting arocking movement of the rockable engaging means for preventing movementof the unit during successive operations of the`withdrawing means;substantially as described. 4

l5. A printing unit adapted to coact with a platen, comprising-a bodyarranged to move in apath toward and away from said,V platen, printingelements carried on said body, means causingthe movement of the unitaway from said .platen and. automatically releasing the. same',v

spring-impelledl means coacting with said unit carrying the same forvAan impact' against 'said platen when said last named means areautomatically released, .and 'feed meansoperable upon the movement 'ofthe printing -unit causing a sequential change of some of the printingelements.

16. A printing unit-of the character described,

vthe .combination with a platen arranged to back a record strip,v of abody member. adapted to move ina path with respect to vsaid platen,printing elements supported on said body member and adapted toy coactwith said platen, means normally retaining lsaid member-'andprinting-elements in -spaced relation with said platen, yieldableengageable-means coacting with said engage said yieldable engaging meansto urge said body member a distance greater than its normal positionfrom said platen whereby said yieldable engageable means will urge thebodymember in the reverse direction for an impact of the printingelements against said platen when said-tripping means is moved freethereof. f

17. An auxiliary printing unit comprising a frame supporting a pluralityof rotatably mounted type carrying elements and adapted to move intoprinting relation with a platen, a base supporting the unit and havingan elongated slot opening therein, yieldable means extending through theelongated slot opening in said basenormally retaining said unit inretracted posia ing elements thereon forming a `unit in printing I 5tion with respect to the platen, spring means coacting with said uniturging the same in o dir'ection, actuating means adapted to ca amovement of said unit against the tension of the spring means and to bedisengaged therefrom at the limit of its movement to permit the unit tobe spring-impelled with its type carrying ele.. ments for an impact onthe platen, said yieldable means being arranged for a free movement withthe unit during the movement of the unit its spring means. f

1s. An auxiliary printing' unit or'tnecharaeier described, comprising aslidably-mounted body member having a plurality of adjustableprintspear-io body member, and tripping means adaptedto erable upon themovement of the unit causing a 'sequential' 'change of said printingunits, and

.normally urging said unit toward the platen', and tripping meansconnected to and operable by the driving mechanism of the adding machinefor urging said unit against the tensiono! its spring 1-0 means wherebysaid spring means will urge the unit to cause theame to move beyond itsyieldvable means which is yieldingly engaging one end of the openinginthe base and permit an impact of the printing elements against .theplaten as the tripping means is moved free of said unit.

19. `An auxiliary' printing unit o! the character described,1 comprisinga body member adaptedjto ,move in a 4path toward and from a platen andhaving adjustable printing units thereon, abase.' an impellent urgingthe unit toward the platen, engaging means causing a movement of theunit against said impellent Vand to release said unit for an impactagainst the platen, feed means op-e spring means coactingwzith said reedmeans and base retaining said feed means readilyoperablel and retainingthe unit in spaced relation with the platen after the impact. -80

MAX amm

